Fixed BARs must be assigned within a bridge window first, before movable
BARs and neighboring bridge windows. Currently they are assigned last by
pdev_assign_fixed_resources().
Let the fixed BARs be handled by pci_assign_resource() in the same way as
it does for movable ones, assigning them in correct order, unifying the
code.
Allow matching IORESOURCE_PCI_FIXED prefetchable BARs to non-prefetchable
windows, so they follow the same rules as non-flagged fixed BARs.
Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@xxxxxxxxx>
---
drivers/pci/setup-bus.c | 43 -----------------------------------------
drivers/pci/setup-res.c | 41 +++++++++++++++++++++++++++++++++++++--
2 files changed, 39 insertions(+), 45 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index a6d8bb5ed43d..1f76a4dffb7d 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1344,47 +1344,6 @@ void pci_bus_size_bridges(struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_size_bridges);
-static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
-{
- int i;
- struct resource *parent_r;
- unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
-
- pci_bus_for_each_resource(b, parent_r, i) {
- if (!parent_r)
- continue;
-
- if ((r->flags & mask) == (parent_r->flags & mask) &&
- resource_contains(parent_r, r))
- request_resource(parent_r, r);
- }
-}
-
-/*
- * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they are
- * skipped by pbus_assign_resources_sorted().
- */
-static void pdev_assign_fixed_resources(struct pci_dev *dev)
-{
- int i;
-
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- struct pci_bus *b;
- struct resource *r = &dev->resource[i];
-
- if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
- !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
- continue;
-
- b = dev->bus;
- while (b && !r->parent) {
- assign_fixed_resource_on_bus(b, r);
- b = b->parent;
- }
- }
-}
-
void __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head)
@@ -1395,8 +1354,6 @@ void __pci_bus_assign_resources(const struct pci_bus *bus,
pbus_assign_resources_sorted(bus, realloc_head, fail_head);
list_for_each_entry(dev, &bus->devices, bus_list) {
- pdev_assign_fixed_resources(dev);
-
b = dev->subordinate;
if (!b)
continue;
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 494eb5a2e98c..a1e61e74ce00 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -331,14 +331,51 @@ static int _pci_assign_resource(struct pci_dev *dev, int resno,
return ret;
}
+static int assign_fixed_resource_on_bus(struct pci_dev *dev, int resno)
+{
+ int i;
+ struct resource *parent_r;
+ unsigned long mask = IORESOURCE_TYPE_BITS;
+ struct resource *r = dev->resource + resno;
+
+ /*
+ * If we have a shadow copy in RAM, the PCI device doesn't respond
+ * to the shadow range
+ */
+ if (r->flags & IORESOURCE_ROM_SHADOW)
+ return 0;
+
+ pci_bus_for_each_resource(dev->bus, parent_r, i) {
+ if (!parent_r)
+ continue;
+
+ if ((r->flags & mask) != (parent_r->flags & mask))
+ continue;
+
+ if (parent_r->flags & IORESOURCE_PREFETCH &&
+ !(r->flags & IORESOURCE_PREFETCH))
+ continue;
+
+ if (resource_contains(parent_r, r)) {
+ if (!request_resource(parent_r, r)) {
+ pci_info(dev, "BAR %d: assigned fixed %pR\n", resno, r);
+ return 0;
+ }
+ }
+ }
+
+ pci_err(dev, "BAR %d: failed to assign fixed %pR\n", resno, r);
+ return -ENOSPC;
+}
+
int pci_assign_resource(struct pci_dev *dev, int resno)
{
struct resource *res = dev->resource + resno;
resource_size_t align, size;
int ret;
- if (res->flags & IORESOURCE_PCI_FIXED)
- return 0;
+ if (res->flags && pci_dev_bar_fixed(dev, res))
+ return assign_fixed_resource_on_bus(dev, resno);
res->flags |= IORESOURCE_UNSET;
align = pci_resource_alignment(dev, res);
--
2.24.1
